Pneumatic hammer.



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A. INVETOR U6 H'Hlll llll HIII nulllllllllrll/ III ,I v 1 wvl IIIIIIIII ARTHUR J. MOQUAIDE, CANTON, Omo.

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Speoication of Letters Patent.

Application led January 22, 1917. Serlal No. 143,819.

To all whom t may concern:

Be it known that I, ARTHUR J. MGQUAIDE, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and use-v ful Improvements in PneumaticHammers, of which the following is a specification.

My invention relates to pneumatic hammers and similar apparatus employing compressed air or steam as 'motive fluid andj over-all length of the hammer barrel is materially lessened, and the weight ofthe hammer is correspondingly reduced.

Another object of my invention is to provide a hammer or similar apparatus having improved means whereby the rivetset or other appliance is yieldingly held in operative position on the hammer barrel and liability of the rivet set or tool becoming accidentally disengaged is prevented and over come, and whereby the rivet set or other appliance is easily and quickly removed and replaced when found necessary or desirable.

A further object of the invention is the provision of a hammer having the novel constructions and arrangements of parts shown in the drawings, to be' more fully described hereinafter and to be particularly pointed out in the appended claims.

Referring now to the drawings forming part of this specification, Figure 1 is a plan partly in section, showing a hammer or riveter constructed and arranged in accordance with my invention.

Fig. 2 is a plan partly in section, showing details in the construction of a socket as made in accordance with my invention.

Fig. 3 is a plan showing details in the construction of the helical spring forming part of my invention.

Fig. 4 is a similar detail plan showing the construction of the slidable collar forming part of this invention.

' Fig. 5 is a transverse section, on a. larger scale, taken on the line V-V of Fig. 1.

In the accompanying drawings, the numeral 2 designates the cylindrical barrel of a pneumatic hammer. A rivet set 3 is removably secured on one end ofthe barrel 2 by means of a hollow counterboredsccket 4,

a helical spring 5, and a slidable rotatable sleeve or collar 6.

The rivet set 3 has a 4cylindrical flange 7 on one end and theusual depression or recess 8 in its opposite end, the so-formed recess 8 shaping 'button heads on the rivets in the rivet headin operations; The counter. bore 9 of the soc et is of a diameter to form a sliding t on the end of the hammer barrel, over which it telescopes when in rivet set holding position, and the flange 7 and reduced portion of the rivet set 3 also form a sliding lit within the hollow socket, the rivet set belng arranged to reciprocate within the socket when using the hammer. v

Adjacent to the socket end of the hammer barrel is a series of three encircling rings or flanges 10, 1 1 and v12, these flanges being formed integrally on the barrel, as shown. One side surface of the flange 10 engages with the end of and forms a stop for the socket 4 when the socket is telescoped over the end of the barrel 2 inoperative Patenten 'Jury ro, i917.

or rivet set holding position. j One side surface of the iange 12 likewise forms a stop for the slidable rotatable collar 6, when it is in socket holding position.

As the flanges 10, 11 and 12 and the handle of the hammer are formed integrally on and are of somewhat greater diameter than that of the cylindrical barrel 2, provision must be made for mounting the collar 6 on the barrel 2 behind the rin or ilange 12. In the construction shown t e collar 6 is bored to a diameter slightly greater than that of the flanges 10, 11 and 12, so that it will slip lover these flanges.' The collar 6 is threaded sleeve or collar 6 also is provided with a similar thread 17 on its periphery. The helical spring 5 which detachably connects the socket 4 to the sleeve or collar 6, is of substantially the same pitch as the threads 16 and 17 and preferably is of rectangular cross section as shown, of a width equal to the space between, and a thickness equal to the depth of the Square threads 16 yand 17.

Obvlously, the spring 5 may be of cylindrical or other cross-section when desired, in such case the threads 16, 17 being changed to suit the spring.

The spring 5 is screwed on the socket 4, its coils engaging the thread 16 and the dowel or screw 18 astened to the socket engages with a notch 19 in the side of the spring 5, adjacent to one end thereof to secure the spring in the socket and prevent relative turning movement thereof. The op'posite end of the helical spring 5 is tapered in thickness and has a bent end-forming a hook 20 which engages with the projection 20a between the threads 17 of the sleeve or collar 6 to secure the spring in place on the collar and yieldingly prevent relative rotative movementl therebetween.

The bore 21 of the hollow cylindrical hammer barrel 2 is provided with the usual reciprocating piston 22, which is adapted to strike the flangedY end ofthe rivet set 3 or other appliance secured in operative position in the socket 4.

A handle 23 is provided on the hammer barrel which is integrally formed thereon and the hammer is also provided with the usual valve and valve operating mechanisms.

Not forming part of this invention these devices are not fully shown or further described, as they may be of any of the various well known constructions.

While in the construction shown the helical spring 5 is fastened to the socket 4 by the pin 18, obviously it may be so fastened to the sliding sleeve 6 and detachably connected to the socket, should construction prove desirable or necessary. In such case a projection 21 such as that on the sliding sleeve would be provided on the socket and a pin 18 on the sleeve instead of on the socket.

It will be noted that the helical spring 5 not only forms means for fastening the socket and rivet setA on the hammer barrel,

but that it forms means for yieldingly holding the rivet snap yin operative position relative to the end of the hammer barrel 2 and reciprocating piston 22, this construction cushioning the blows of the piston on the rivet set, as will be readily understood.

The advantages of my invention will be" apparent to those Skilled in the art. The

number of parts forming the mechanism for securing the detachable rivet setor other appliance in operative position on the hammer is lessened, the over-all length of the hammer barrel and weight of the hammer are reduced, and a fastening is provided which is easily and quickly detached when desired, and which securely holds the rivet set in operative position. I

Modifications 1n the construction and arrangement of parts may be made without departing from my invention as dened in rel, a counterbored socket telescoped over one end of the barrel and having a rivet set mounted in the counterbore thereof, a sleeve secured on said barrel to rotate relative thereto, said sleeve and socket having eX-` ternal screw threads thereon, and a helical spring adapted to screw on said threads to fasten the socket and rivet set in operative position on the hammer barrel.

3. A hammer or the like-comprising a hammer barrel, a counterbored socket telescoped over one end of Said barrel, a rotatable sleeve on the barrel, said sleeve having external screw threads thereon, a helical spring on said socket, said spring being adapted to screw on the threaded surface of said sleeve, and co-acting means on said spring and sleeve to prevent the spring unscrewing from the sleeve while the hammer is in use.

4. A hammer or the like comprising a hammer barrel, a socket on one end of 'the barrel, said socket and barrel having helical screw threads on the outer surface thereof and a helical spring connected with said screw threads to fasten the socket to the hammer barrel and adapted to frictionally hold the socket against rotative movement on the hammer barrel. f v

5. A hammer or the like comprising a hammer barrel member, a socket member removably secured on said hammer barrel, at least one of said members having a threaded surface, and a helical spring on one and arranged to screw on the threads of the other f screw threads to fasten the socket to the hammer barrel, said spring being arranged to yieldingly hold the socket in position on the end of the hammer barrel.

7. A pneumatic hammer comprising a hammer barrel having a reciprocating piston therein, a removable socket on onev end of said barrel having a rivet set removably secured therein, said piston being adapted to strike the end of said rivet set in operating the hammer, screw threads on said socket and said barrel and a helical spring for detachably securing the socket on the hammer barrel, said spring being arranged to screw on said threads to fasten the socket on said barrel.

8. A pneumatic hammer comprising a hammer barrel having a reciprocating piston therein, a removable counterbored socket on one end of said barrel having a flanged tool removably secured therein, said piston being adapted to strike the lianged end of said tool in operating the hammer, screw threads on said socket and barrel and a helical spring for detachably securing the socket on the hammer barrel, said spring being arranged to screw on said threads to fasten the socket on said barrel.

In testimony whereof I have hereunto set my hand.

ARTHUR J. MCQUAIDE. 

